NEW INFORMATION: Lawton Toddler's Death Ruled Homicide

Authorities say a 2-year-old Lawton girl has been placed in protective custody with the Oklahoma Department of Human Services after she allegedly struck her 1-year-old brother with a hammer, killing him.

The state medical examiner's office says the boy died of blunt force trauma to the head and abdomen. Lawton police Lt. Larry Lafrance tells The Lawton Constitution that the case has been ruled a homicide and that officers have interviewed the boy's 22-year-old mother several times. She was not home at the time of the incident.

Lafrance says police will question the mother's 16-year-old boyfriend, who was reportedly caring for the children at the time.

The boy, who has not been identified, died Tuesday night at an Oklahoma City hospital.